CHA Gearbox code - Any info anyone?

[Riley 0]

Does anyone have any info/ratio's etc for the CHA gearbox?

 

Cheers,Neil. :)

[RedTyphoon 0]

http://www.gti-vr6.net/wiki/index.php?t ... 27s_ratios :wink:

[Riley 0]

Cheers mate 8)

 

So it uses the correct flanges? Same size output/spline shaft?

 

Neil.

[s1m0n 0]

http://www.gti-vr6.net/wiki/index.php?title=VW_transmissions%27s_ratios :wink:

 

Not sure that's correct, I have a CHA, taken from a turbo diesel B3, my understanding is ratio's as follows: -

 

CHA 1st - 3.78, 2nd - 2.12, 3rd - 1.36, 4th - 1.09, 5th - 0.72, FD - 3.94

 

As for fitting, yea any 4cyl C that has an 02A - No problem

 

Cheers

 

Simon

[RedTyphoon 0]

http://www.techtonicstuning.com/trannyratios.asp :shrug:

[s1m0n 0]

http://www.techtonicstuning.com/trannyratios.asp :shrug:

 

Just been on VAG CAT and checked the teeth: -

 

1st - 34/9 = 3.77

2nd - 36/17 = 2.12

3rd - 34/25 = 1.36

4th - 33/36 = 0.92

5th - 33/46 = 0.72

FD - 71/18 = 3.94

 

And it's listed for the B3 so looks like Techtonics have it right and I was wrong about 4th!

 

Cheers

 

Simon

[Riley 0]

Cheers lads, now the question...Anyone know what speeds this box would give in each gear?

 

Im trying to compare it to the CTN code box.

 

Cheers for the help.

Neil.

[s1m0n 0]

What tyres are you running

[Riley 0]

215/45/16 mate :D

[s1m0n 0]

There are several ways to do it, I do it this way, tyre diameter*pie*revs/1056*gear*FD

 

Your 215/45/16 comes back as having a 23.61 diameter, so, 23.61*3.1416*1000/1056*3.77*3.94 will give you the speed in first gear at 1000 rpm (I make it 4.72)

 

I usually use a spreadsheet so I can get a nice little graph to overlay onto my dyno plot

 

Cheers

 

Simon